There are acouple places that will make a banner for you for free:
http://members.tripod.com/~Frye27/index1.html
http://www.geocities.com/SouthBeach/Surf/4839/banner.html
http://www.nybass.com/franksbanners/franksbanners.htm

I'm not sure exactly what you're asking. If you mean a .gif banner to advertise a page, then you can download an image creation program (such as Paint Shop Pro, available at www.jasc.com) and create the banner.

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